In what’s become much of an annual tradition, Ryan announced the highly-anticipated line-up for Wango Tango 2011 Monday morning on his L.A. morning show. Every year, 102.7 KIIS-FM’s Summer mega-concert features some of the biggest acts in music on one stage, for one night only.

It all goes down Saturday, May 14th at the Staples Center in Downtown L.A. Tickets go on sale to KIIS Club VIPs on Friday, April 1, and to the public on Saturday, April 2 (if you’re not a VIP, click here to sign up). Check out the full line-up below and click here to visit the official Wango Tango website.

HOSTED BY RYAN SEACREST & GUEST HOST BRITNEY SPEARS

As she prepares for a summer concert tour following the release of her sixth studio album Femme Fatale tomorrow, Britney Spears will join Ryan on stage at Wango Tango to guest host the festivities. Britney has performed at Wango twice, in 1999 and 2001.